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Series H3 Explosion-Proof Differential Pressure Switch
Brand: Dwyer Instruments, LLCExplosion-proof Series H3 Explosion-Proof Differential Pressure Switch, heavy duty, industrial unit has a unique new design which provides sensitivity to differential pressures as low as 10 inches of water (254 mm w.c.), yet handles total pressure of 1500 psi (103 bar).
Unlike common differential pressure switches that use a piston-type motion transfer, the Series H3 utilizes a rotary motion transfer shaft that prevents a change in total pressure from causing a setpoint shift.
Unit yields deadbands approximately 5% of range, with zero setpoint shift due to variation in working pressures. Friction is minimized and repeatability increased by allowing range spring to act directly on diaphragm plate.
Rolling diaphragm design maintains constant effective area to further reduce friction. Diaphragm is allowed to "seat", allowing application of full rated pressure, up to 1500 psi (103 bar), on either high or low pressure port, without damage. Special over-travel feature prevents overtightening of range adjust screw.
Choose optional 316SS chamber for water and water-based fluids or harsher applications.
Features- Rotary motion design prevents set point shifts
- Explosion-proof housing for use in applications where protection of process and personnel is needed
- Option for use with water and water-based solution makes this a versatile switch
Specifications
Adjustment Type
- Factory Set (Pre-Set)
- Field Adjustable
Approvals & Certifications
- ATEX
- CE
- CSA
- UL
Deadband, Approximate
- Approximately 5 % of Range
Diaphragm Material
- Fluoroelastomer
- Nitrile
Electrical Connectors
- 18 AWG x 18” Leadwires
- 3/4” NPT Female
- ATEX Approved Internal Terminal Block
- UL, CSA Approved Internal Terminal Block
Electrical Contacts
- Gold
- Silver
Electrical Rating
- 5 A at 125/250 Vac, 30 Vdc
Enclosure, Body Material
- Aluminum
Environmental Protection
- IP56
- IP66
- NEMA 3, 4X / IP56, 66
- NEMA 4X
NPT Connection
- 1/8” NPT Female
O-Ring Material
- Nitrile
- Viton
Operating Temperature
- -20° to 104° C (-4° to 220° F)
Process Connection Material
- 316 Stainless Steel
- Aluminum
Process Temperature
- -20° to 90° C (-4° to 220° F)
Set Point - Decreasing
- bar: 0.03 to 13.8
- Inches WC: 10 to 80
- kPa: 3.447 to 1,379
- psid: 0.5 to 200
Set Point - Increasing
- bar: 0.03 to 13.8
- Inches WC: 10 to 180
- kPa: 3.447 to 1,379
- psid: 0.5 to 200
Switch Type
- DPDT
- SPDT
System Pressure
- bar: 103.4
- kPa: 10,342
- psi: 1,500
- Water Flow Proving with an Orifice Plate.
- Differential Pressure Across Chiller.
- Liquid Filter Status.
- Perfect for Monitoring Differential Water Pressure on Filters, Chiller Coils, and Flow Elements.
